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Published on: February 11, 2016
TEM observations of Au and Ir particles supported on CeO2
Tomoki Akita1, Mitsutaka Okumura, Koji Tanaka
1Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, AIST Kansai, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577, Japan. t-akita@aist.go.jp
Abstract:
Au/CeO2 and Ir/CeO2 catalysts were observed by a transmission electron microscope in order to investigate the nano-structures of Au and Ir particles and CeO2 grains and the interface structure between metallic particles and CeO2. An annular dark field scanning transmission electron microscope (ADF-STEM) and an energy dispersive X-ray spectroscopy (EDS) revealed that the metallic particles smaller than 2 nm in diameter are highly dispersed on CeO2 supports in both catalysts. For model samples of larger CeO2 particles with flat facets of low-index surfaces, high resolution transmission electron microscopy observations of Au/CeO2 and Ir/CeO2 interfaces were made and the epitaxial relationship between Au and CeO2, (111)[110]Au//(111)[110]CeO2 has been found for the first time.
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